72881722 has 4 divisors (see below), whose sum is σ = 109322586. Its totient is φ = 36440860.

The previous prime is 72881707. The next prime is 72881741. The reversal of 72881722 is 22718827.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 48566961 + 24314761 = 6969^2 + 4931^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18220429 + ... + 18220432.

Almost surely, 2^72881722 is an apocalyptic number.

72881722 is a deficient number, since it is larger than the sum of its proper divisors (36440864).

72881722 is a wasteful number, since it uses less digits than its factorization.

72881722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36440863.

The product of its digits is 25088, while the sum is 37.

The square root of 72881722 is about 8537.0792429261. The cubic root of 72881722 is about 417.7080789543.

The spelling of 72881722 in words is "seventy-two million, eight hundred eighty-one thousand, seven hundred twenty-two".